Battery monomer, battery, power utilization device, and battery processing equipment and method

Abstract

The invention is applicable to the technical field of batteries, and provides a single battery, a battery, a power utilization device, and battery processing equipment and method.The power utilization device comprises the battery, the battery comprises the single battery, the single battery comprises an electrode assembly, the electrode assembly comprises a positive pole piece, a negative pole piece and a diaphragm, and the positive pole piece, the negative pole piece and the diaphragm are stacked or wound; part of the diaphragm exceeds the edge of the positive pole piece and the edge of the negative pole piece to form an edge sealing part, and at least part of the edge sealing part is fixedly connected. The battery processing equipment comprises an edge sealing device which is used for fixing at least part of the edge sealing part of the diaphragm. The battery processing method comprises the step of fixedly connecting at least part of the edge sealing part of the diaphragm. According to the arrangement, the diaphragm can stably and firmly wrap the positive pole piece and the negative pole piece, so that the problem of lap joint of the positive pole piece and the negative pole piece caused by turnover of the diaphragm can be solved, and the reliability of the single battery can be further improved.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and more specifically, relates to a battery cell, a battery, an electrical device, a battery processing device and method. Background Art

[0002] In the related art, a battery cell usually includes a housing and at least part of an electrode assembly disposed inside the housing. Among them, the electrode assembly is mainly formed by laminating or winding a positive electrode sheet and a negative electrode sheet, and a separator is provided between the positive electrode sheet and the negative electrode sheet.

[0003] In some cases, the separator has a risk of folding. When the separator folds, it will not be able to wrap the electrode sheet, resulting in the lap of the positive electrode sheet and the negative electrode sheet and causing the problem of self-discharge of the electrode assembly. Summary of the Invention

[0004] In view of the above problems, the embodiments of this application provide a battery cell, a battery, an electrical device, a battery processing device and method, which can improve the technical problem that the folding of the separator causes the lap of the positive electrode sheet and the negative electrode sheet.

[0005] In a first aspect, the embodiments of this application provide a battery cell, including an electrode assembly. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator, and the positive electrode sheet, the negative electrode sheet and the separator are laminated or wound. A part of the separator extends beyond the edges of the positive electrode sheet and the negative electrode sheet to form a sealing edge portion, and at least part of the sealing edge portion is fixedly connected.

[0006] For the battery cell provided by the embodiments of this application, by making at least part of the separator extend beyond the edges of the positive electrode sheet and the negative electrode sheet to form a sealing edge portion, and at least part of the sealing edge portion is fixedly connected, at least part of the separator is fixedly connected outside the edges of the positive electrode sheet and the negative electrode sheet, so that the position of at least part of the separator can be fixed to a certain extent. In this way, the separator can stably and reliably wrap the positive electrode sheet and the negative electrode sheet to achieve insulation between the positive electrode sheet and the negative electrode sheet, thereby improving the problem that the folding of the separator causes the lap of the positive electrode sheet and the negative electrode sheet, and further improving the reliability of the battery cell.

[0007] In some embodiments, the sealing edge portions located outside the edges of the same end of the positive electrode sheet and the negative electrode sheet are fixedly connected.

[0008] In this way, the sealing edge portions at each end can wrap the positive electrode sheet and the negative electrode sheet at the corresponding end, so that the separator can stably achieve insulation between the positive electrode sheet and the negative electrode sheet, thereby improving the problem of lap of the positive electrode sheet and the negative electrode sheet at the corresponding end.

[0009] In some embodiments, a sealing portion is fixedly connected to form a fixed area outside the edges at the same end of the positive electrode plate and the negative electrode plate, and the fixed areas are arranged at intervals or continuously.

[0010] With such an arrangement, the fixing operation of the sealing portion is very flexible.

[0011] In addition, by arranging the fixed areas at intervals outside the edges at the same end of the positive electrode plate and the negative electrode plate, it is convenient for the electrolyte to infiltrate from the sealing portion to the middle position of the electrode assembly, thereby improving the infiltration efficiency of the electrode assembly.

[0012] In some embodiments, a positive electrode tab and a negative electrode tab are arranged at intervals at one end of the electrode assembly along the first direction, or a positive electrode tab and a negative electrode tab are respectively arranged at opposite ends of the electrode assembly along the first direction; the positive electrode tab is connected to the positive electrode plate, the negative electrode tab is connected to the negative electrode plate, and a sealing portion is arranged outside at least one end of the positive electrode plate and the negative electrode plate along the first direction.

[0013] With such an arrangement, the sealing portion outside at least one end of the positive electrode plate and the negative electrode plate along the first direction can be fixedly connected, so that the separator can wrap the positive electrode plate and the negative electrode plate at at least one end of the electrode assembly along the first direction, thereby improving the problem of the overlap of the positive electrode plate and the negative electrode plate at at least one end in the first direction.

[0014] In some embodiments, sealing portions are arranged outside opposite ends of the positive electrode plate and the negative electrode plate along the first direction, and the sealing portions outside each end of the positive electrode plate and the negative electrode plate along the first direction are fixedly connected.

[0015] In this way, the problem of the overlap of the positive electrode plate and the negative electrode plate at opposite ends in the first direction can be improved.

[0016] In some embodiments, the positive electrode tab and the negative electrode tab are arranged at intervals at one end of the electrode assembly along the first direction, and a sealing portion is arranged outside the end of the positive electrode plate and the negative electrode plate where the positive electrode tab and the negative electrode tab are located; the sealing portion outside the end of the positive electrode plate and the negative electrode plate where the positive electrode tab and the negative electrode tab are located is fixedly connected and fixed to the positive electrode tab and / or the negative electrode tab.

[0017] With such an arrangement, the problem of the positive electrode tab overlapping the negative electrode plate after being bent can be improved; and / or, the problem of the negative electrode tab overlapping the positive electrode plate after being bent can be improved.

[0018] In some embodiments, the positive electrode tab and the negative electrode tab are respectively arranged at opposite ends of the electrode assembly along the first direction, and sealing portions are arranged outside opposite ends of the positive electrode plate and the negative electrode plate along the first direction;

[0019] The sealing edge portion outside one end of the positive electrode tab of the positive electrode plate and the negative electrode plate is fixedly connected and fixed to the positive electrode tab; and / or, the sealing edge portion outside one end of the negative electrode tab of the positive electrode plate and the negative electrode plate is fixedly connected and fixed to the negative electrode tab.

[0020] With such an arrangement, on the one hand, the problem of self-discharge of the electrode assembly caused by the positive electrode tab overlapping the negative electrode plate can be improved; and / or, the problem of self-discharge of the electrode assembly caused by the negative electrode tab overlapping the positive electrode plate can be improved. On the other hand, it helps to improve the infiltration speed and infiltration amount of the electrolyte, so that the electrolyte infiltration of the battery cell and the cycle performance of the battery cell can be improved.

[0021] In some embodiments, the positive electrode plate, the negative electrode plate and the separator are stacked along the second direction; sealing edge portions are provided outside at least one end of the positive electrode plate and the negative electrode plate along the third direction; wherein, the first direction, the second direction and the third direction are mutually perpendicular to each other.

[0022] With such an arrangement, the sealing edge portions outside at least one end of the positive electrode plate and the negative electrode plate along the third direction can be fixedly connected, so that the separator can wrap the positive electrode plate and the negative electrode plate at least at one end of the electrode assembly along the third direction, thereby improving the problem of overlap of the positive electrode plate and the negative electrode plate at least at one end in the third direction.

[0023] In some embodiments, sealing edge portions are provided outside both opposite ends of the positive electrode plate and the negative electrode plate along the third direction, and the sealing edge portions outside each end of the positive electrode plate and the negative electrode plate along the third direction are fixedly connected.

[0024] In this way, the problem of overlap of the positive electrode plate and the negative electrode plate at the opposite ends in the third direction can be improved.

[0025] In some embodiments, the sealing edge portion is fixed by heat sealing;

[0026] Alternatively, an adhesive layer is provided at the sealing edge portion of the separator, and the sealing edge portion is fixedly connected through the adhesive layer.

[0027] With such an arrangement, there are more operation methods for fixedly connecting the sealing edge portions, and the flexibility is higher.

[0028] In a second aspect, an embodiment of the present application provides a battery, including a battery cell.

[0029] For the battery provided by the embodiment of the present application, by adopting the battery cell involved above, the problem of overlap of the positive electrode plate and the negative electrode plate caused by the folding of the separator can be improved, so as to improve the reliability of the battery cell, and further improve the reliability of the battery.

[0030] In a third aspect, an embodiment of the present application provides an electrical device, including a battery cell or a battery.

[0031] The power consumption device provided by the embodiment of the present application can improve the reliability of the battery cell by adopting the battery cell or battery involved above, so as to improve the reliability of the battery, and further improve the reliability of the power consumption device.

[0032] Fourthly, the embodiment of the present application provides a battery processing device, which is applied to a battery cell; including:

[0033] An edge sealing device for fixedly connecting at least part of the edge sealing part beyond the edges of the positive electrode plate and the negative electrode plate of the separator.

[0034] The battery processing device provided by the embodiment of the present application can fix at least part of the edge sealing part beyond the edges of the positive electrode plate and the negative electrode plate of the separator by setting the edge sealing device, so that at least part of the separator is fixedly connected beyond the edges of the positive electrode plate and the negative electrode plate, and further the position of at least part of the separator can be fixed to a certain extent. In this way, the separator can stably and firmly wrap the positive electrode plate and the negative electrode plate to isolate the positive electrode plate and the negative electrode plate, realize insulation between the positive electrode plate and the negative electrode plate, thereby improving the problem of overlap between the positive electrode plate and the negative electrode plate caused by the folding of the separator, and further improving the reliability of the battery cell.

[0035] In some embodiments, the edge sealing device includes:

[0036] A connecting piece;

[0037] A heating element, which is arranged on the connecting piece and is used to heat the edge sealing part to fix the edge sealing part.

[0038] With such a setting, heat sealing fixation of the edge sealing part can be achieved.

[0039] In some embodiments, the edge sealing device includes one heating element; or, the edge sealing device includes a plurality of heating elements, and the plurality of heating elements are arranged at intervals on one side of the connecting piece.

[0040] With such a setting, the fixed areas formed by fixing the edge sealing parts at the same end of the electrode assembly are continuously arranged or arranged at intervals.

[0041] In some embodiments, the battery processing device further includes:

[0042] An assembling device for assembling an electrode assembly to form a battery cell;

[0043] A stacking device for stacking a plurality of battery cells to form a battery.

[0044] With such a setting, a battery can be obtained.

[0045] Fifthly, the embodiment of the present application provides a battery processing method, which is applied to a battery cell; including:

[0046] Fix and connect at least a part of the edge-sealing portion of the separator that extends beyond the edges of the positive electrode plate and the negative electrode plate.

[0047] In the battery processing method provided by the embodiments of the present application, by fixing at least a part of the edge-sealing portion of the separator that extends beyond the edges of the positive electrode plate and the negative electrode plate, at least a part of the separator is fixedly connected outside the edges of the positive electrode plate and the negative electrode plate, so that the position of at least a part of the separator can be fixed to a certain extent. In this way, the separator can stably and firmly wrap the positive electrode plate and the negative electrode plate to isolate the positive electrode plate and the negative electrode plate, realizing insulation between the positive electrode plate and the negative electrode plate, thereby improving the problem of overlap between the positive electrode plate and the negative electrode plate caused by the folding of the separator, and further improving the reliability of the battery cell.

[0048] In some embodiments, fixing and connecting at least a part of the edge-sealing portion of the separator that extends beyond the edges of the positive electrode plate and the negative electrode plate includes:

[0049] Fix and connect the edge-sealing portion of the separator that is outside the edges of the positive electrode plate and the negative electrode plate at the same end.

[0050] In this way, the edge-sealing portions at each end can wrap the positive electrode plate and the negative electrode plate at the corresponding end, so that the separator can stably achieve insulation between the positive electrode plate and the negative electrode plate, thereby improving the problem of overlap between the positive electrode plate and the negative electrode plate at the corresponding end.

[0051] In some embodiments, fixing and connecting the edge-sealing portion of the separator that is outside the edges of the positive electrode plate and the negative electrode plate at the same end includes:

[0052] Press the edge-sealing device on the edge-sealing portion of the separator that extends beyond the edges of the positive electrode plate and the negative electrode plate at the same end;

[0053] The edge-sealing device heats the edge-sealing portion.

[0054] By adopting the above technical solution, the edge-sealing portion is fixed by heat sealing.

[0055] In some embodiments, before fixing and connecting at least a part of the edge-sealing portion of the separator that extends beyond the edges of the positive electrode plate and the negative electrode plate, it includes:

[0056] Stack or wind the positive electrode plate, the negative electrode plate and the separator.

[0057] With such a setting, after the positive electrode plate, the negative electrode plate and the separator are stacked or wound to form an electrode assembly, the operation of fixing and connecting the edge-sealing portion is performed.

[0058] The above description is only an overview of the technical solution of this application. In order to understand the technical means of this application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of this application more obvious and understandable, the following specifically presents the specific implementation manners of this application. Description of the Drawings

[0059] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0060] Figure 1 Schematic diagram of a vehicle provided for some embodiments of this application;

[0061] Figure 2 Exploded view of a battery provided for some embodiments of this application;

[0062] Figure 3 Exploded view of a battery cell provided for some embodiments of this application;

[0063] Figure 4 For this application Figure 3 Partial expanded view of the electrode assembly of the battery cell provided;

[0064] Figure 5 Schematic diagram of a battery cell provided for some other embodiments of this application;

[0065] Figure 6 For Figure 5 Schematic diagram of the electrode assembly of the battery cell provided;

[0066] Figure 7 Schematic diagram of the electrode assembly of the battery cell provided for some other embodiments of this application;

[0067] Figure 8 For Figure 6 Cross-sectional view along A-A;

[0068] Figure 9 For Figure 8 Schematic diagram before fixing the edge sealing part;

[0069] Figure 10 For Figure 6 Side view of the electrode assembly under some embodiments provided;

[0070] Figure 11 For Figure 6 Side view of the electrode assembly under some other embodiments provided;

[0071] Figure 12 For Figure 7 Cross-sectional view along B-B;

[0072] Figure 13 Schematic diagram of a battery processing device provided by some embodiments of the present application;

[0073] Figure 14 Schematic diagram of an edge sealing device of a battery processing device provided by some embodiments of the present application;

[0074] Figure 15 Schematic diagram of an edge sealing device of a battery teaching device provided by other embodiments of the present application;

[0075] Figure 16 Method flow chart of a battery processing method provided by some embodiments of the present application.

[0076] Among them, each reference numeral in the figure:

[0077] 1000 - Vehicle; 100 - Battery; 200 - Controller; 300 - Motor; 10 - Battery cell; 20 - Box body; 201 - Accommodating space; 21 - First part; 22 - Second part; 11 - Electrode assembly; 111 - Positive electrode tab; 112 - Negative electrode tab; 113 - Separator; 1131 - Edge sealing part; 1132 - Main body part; 114 - Positive electrode ear; 115 - Negative electrode ear; 12 - Housing assembly; 121 - Housing; 122 - End cover; 2000 - Battery processing device; 2100 - Edge sealing device; 2110 - Connecting piece; 2120 - Heating piece; 2200 - Assembly device; 2300 - Stacking device; 2400 - Winding device; m - Fixed area; a - Main body structure; L - Central axis; Z - First direction; Y - Second direction; X - Third direction. Detailed description of the specific implementation

[0078] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and should not be construed as a limitation to the present application.

[0079] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0080] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0081] In the description of this application, "a plurality of" means more than two. Unless otherwise specifically defined, "more than two" includes two. Correspondingly, "a plurality of groups" means more than two groups, including two groups.

[0082] In the description of this application, unless otherwise clearly specified and limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0083] In the description of this application, the term "and / or" is merely an associative relationship describing associated objects, indicating that there can be three relationships. For example, A and / or B can mean: there is A, there is both A and B, and there is B. In addition, in this application, the character " / " generally represents an "or" relationship between the front and rear associated objects.

[0084] Although this application has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of this application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. This application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

[0085] A battery cell generally may include a housing and an electrode assembly disposed at least partially within the housing. The electrode assembly is the component in the battery cell where an electrochemical reaction occurs. Among them, the electrode assembly is mainly formed by laminating or winding a positive electrode plate and a negative electrode plate, and a separator is provided between the positive electrode plate and the negative electrode plate. The separator is an insulating structure with insulating properties, and is used to achieve insulation between the positive electrode plate and the negative electrode plate to improve the problem of self-discharge of the electrode assembly caused by the overlap of the positive electrode plate and the negative electrode plate.

[0086] In some cases, after the positive electrode sheet, the negative electrode sheet and the separator form an electrode assembly, the separator has a risk of folding. Among them, when the separator folds, there is a risk that it cannot wrap the electrode sheet, resulting in the problem that the positive electrode sheet and the negative electrode sheet overlap and cause self-discharge of the electrode assembly. Herein, the electrode sheet mentioned here can be a positive electrode sheet or a negative electrode sheet.

[0087] Based on the above considerations, the embodiments of the present application provide a battery cell, a battery, an electrical device, a battery processing device and a method. By making at least part of the separator extend beyond the edges of the positive electrode sheet and the negative electrode sheet to form a sealing edge portion, and at least part of the sealing edge portion is fixedly connected, at least part of the separator is fixedly connected outside the edges of the positive electrode sheet and the negative electrode sheet, so that the position of at least part of the separator can be fixed to a certain extent. In this way, the separator can stably and reliably wrap the positive electrode sheet and the negative electrode sheet to achieve insulation between the positive electrode sheet and the negative electrode sheet, thereby improving the problem that the positive electrode sheet and the negative electrode sheet overlap due to the folding of the separator, and further improving the reliability of the battery cell.

[0088] It should be noted here in advance that the battery processing device and the method refer to the battery processing device and the battery processing method.

[0089] In some embodiments, the battery cell and the battery involved in the embodiments of the present application can be used in an electrical device that uses the battery cell or the battery as a power source.

[0090] The electrical device involved in the embodiments of the present application can be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, battery cars, vehicles, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc. Divided by power source, the vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. Divided by drive mode, the vehicle can be a front-wheel drive vehicle, a rear-wheel drive vehicle or a four-wheel drive vehicle.

[0091] In other embodiments, the battery cell and the battery involved in the embodiments of the present application can also be used in energy storage devices. Among them, the energy storage device can be an energy storage container, an energy storage cabinet, etc.

[0092] The battery involved in the embodiments of the present application can be a single physical module including one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel or in a hybrid connection through a busbar component, and the hybrid connection means that there are both series and parallel connections among the multiple battery cells.

[0093] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module. As an example, the multiple battery cells may be fixed by cable ties or the like to form a battery module. As an example, the multiple battery cells may also be fixed by end plates, side plates, etc. to form a battery module.

[0094] In other embodiments, the battery may be a battery pack, and the battery pack may include a box body and battery cells. As an example, the battery cells may be directly accommodated in the box body. As an example, multiple battery cells may also first form a battery module and then be accommodated in the box body.

[0095] The battery cell involved in the embodiments of the present application refers to the smallest unit for storing and outputting electric energy. Among them, the battery cell may be a secondary battery or a primary battery. The battery cell may be, but is not limited to, a metal battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cell may be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes.

[0096] For ease of description, the embodiments of the present application are described by taking the electrical device as a vehicle as an example.

[0097] In some embodiments, please refer to Figure 1 , Figure 1 is a schematic diagram of a vehicle 1000 provided in some embodiments of the present application. The battery 100 is disposed inside the vehicle 1000, and the battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000. For example, the battery 100 may be used as the operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0098] In some embodiments, the battery 100 may not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0099] In some embodiments, please refer to Figure 2 , Figure 2 is an exploded schematic diagram of the battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 20 and multiple battery cells 10. The box body 20 is a structure having an accommodation space 201 inside, and the box body 20 may adopt various structures. In some embodiments, the box body 20 may include a first part 21 and a second part 22. The first part 21 and the second part 22 are covered with each other and jointly define the above-mentioned accommodation space 201.

[0100] Among them, the first part 21 can be a hollow structure with an opening at one end, and the second part 22 is a plate-like structure. The second part 22 covers the opening side of the first part 21 so that the first part 21 and the second part 22 jointly define the above-mentioned accommodation space 201. Or, please refer to Figure 2 , both the first part 21 and the second part 22 can be hollow structures with an opening at one end. The opening side of the first part 21 covers the opening side of the second part 22 so that the first part 21 and the second part 22 jointly define the above-mentioned accommodation space 201.

[0101] Among them, the box body 20 composed of the first part 21 and the second part 22 can be of various shapes, such as a cylinder, a cuboid, etc.

[0102] In some embodiments, please refer to Figure 2 , multiple battery cells 10 can be formed into a whole through series connection, parallel connection or mixed connection, and then the whole formed by the multiple battery cells 10 is directly accommodated in the above-mentioned accommodation space 201 of the box body 20. In other embodiments, multiple battery cells 10 can also be first connected in series, parallel or in a mixed way, arranged and fixed to form a battery module, and the battery module is accommodated in the above-mentioned accommodation space 201 of the box body 20. In still other embodiments, multiple battery cells 10 can also be first connected in series, parallel or in a mixed way, arranged and fixed to form multiple battery modules, and the multiple battery modules are then connected in series, parallel or in a mixed way to form a whole and are accommodated in the above-mentioned accommodation space 201 of the box body 20.

[0103] In some embodiments, the box body 20 of the battery 100 can be used as a part of the chassis structure of the vehicle 1000. For example, a part of the box body 20 can become at least a part of the chassis of the vehicle 1000, or a part of the box body 20 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0104] In some embodiments, please refer to Figures 3 to 7 together with other drawings. Figure 3 is an exploded view of the battery cell 10 provided in some embodiments of the present application, Figure 4 is a partially unfolded view of the electrode assembly 11 of the battery cell 10 provided in some embodiments of the present application, Figure 5 is a schematic diagram of the battery cell 10 provided in other embodiments of the present application, Figure 6 is a schematic diagram of the electrode assembly 11 of the battery cell 10 provided in other embodiments of the present application. Figure 7 is a schematic diagram of the electrode assembly 11 of the battery cell 10 provided in still other embodiments of the present application, specifically a schematic diagram from the perspective of the second direction Y involved below. Among them, Figures 3 to 6Among them, the electrode assembly 11 is mainly formed by winding a positive electrode sheet 111, a negative electrode sheet 112, and a separator 113, which is a winding structure involved in the following text. Figure 7 Among them, the electrode assembly 11 is mainly formed by stacking a positive electrode sheet 111, a negative electrode sheet 112, and a separator 113, which is a stacking structure involved in the following text.

[0105] The battery cell 10 may include an electrode assembly 11.

[0106] The electrode assembly 11 is a component in the battery cell 10 where an electrochemical reaction occurs. Among them, the electrode assembly 11 is mainly formed by winding a positive electrode sheet 111 and a negative electrode sheet 112, which is a winding structure, as Figures 3 to 6 shown; alternatively, the electrode assembly 11 is mainly formed by stacking a positive electrode sheet 111 and a negative electrode sheet 112, which is a stacking structure, as Figure 7 shown. And, a separator 113 is provided between the positive electrode sheet 111 and the negative electrode sheet 112.

[0107] Among them, when the electrode assembly 11 is a winding structure, the positive electrode sheet 111, the negative electrode sheet 112, and the separator 113 are wound and arranged.

[0108] Among them, when the electrode assembly 11 is a stacking structure, multiple separators 113 can be alternately stacked between the positive electrode sheet 111 and the negative electrode sheet 112, that is, the positive electrode sheet 111, the negative electrode sheet 112, and the separator 113 are stacked to form the electrode assembly 11, as Figure 7 shown; alternatively, the separator 113 can also be arranged between the positive electrode sheet 111 and the negative electrode sheet 112 in a winding manner, that is, the separator 113 is bent during the process of alternately stacking the positive electrode sheet 111 and the negative electrode sheet 112, so that there is a separator 113 between the positive electrode sheet 111 and the negative electrode sheet 112. That is, the positive electrode sheet 111, the negative electrode sheet 112, and the separator 113 are wound and arranged.

[0109] Among them, both the positive electrode sheet 111 and the negative electrode sheet 112 have active substances. The electrode assembly 11 is also provided with a positive electrode tab 114 and a negative electrode tab 115. The positive electrode tab 114 is connected to the positive electrode sheet 111, and the negative electrode tab 115 is connected to the negative electrode sheet 112. The positive electrode tab 114 and the negative electrode tab 115 can be located at one end of the electrode assembly 11 together, as Figure 3 and Figure 4 shown; alternatively, the positive electrode tab 114 and the negative electrode tab 115 can also be located at opposite ends of the electrode assembly 11 respectively, as Figures 5 to 7 shown. The separator 113 is an insulating structure with insulating properties, which is used to achieve insulation between the positive electrode sheet 111 and the negative electrode sheet 112, so as to improve the problem of self-discharge of the electrode assembly 11 caused by the overlap of the positive electrode sheet 111 and the negative electrode sheet 112.

[0110] In the battery cell 10, the shape of the electrode assembly 11 can be cylindrical, square, flat, etc.

[0111] In the battery cell 10, the number of the electrode assemblies 11 can be one or multiple.

[0112] In some cases, the electrode assembly 11 can also be referred to as a bare battery cell, a winding structure, a stacking structure, etc.

[0113] In some embodiments, the battery cell 10 may further include an electrolyte, and the electrolyte functions to conduct ions between the positive electrode plate 111 and the negative electrode plate 112. Among them, during the movement of ions between the positive electrode plate 111 and the negative electrode plate 112, the ions need to pass through the separator 113 between the positive electrode plate 111 and the negative electrode plate 112. Among them, the electrolyte involved in the embodiments of the present application can be liquid, gel or solid.

[0114] In some embodiments, please refer to Figures 3 to 5 and in combination with other drawings. The battery cell 10 may further include a housing assembly 12. The housing assembly 12 refers to a component or assembly for defining the internal environment of the battery cell 10, and the electrode assembly 11 and the electrolyte are accommodated in the housing assembly 12.

[0115] In some embodiments, please refer to Figures 3 to 5 and in combination with other drawings. The housing assembly 12 may include a housing 121 and an end cap 122. The housing 121 and the end cap 122 are components for jointly defining the internal environment of the battery cell 10, and the internal environment defined by the housing 121 and the end cap 122 is used to accommodate the electrode assembly 11 and the electrolyte. Among them, the housing 121 and the end cap 122 can be independent components. Specifically, the housing 121 has an opening, and the end cap 122 is covered on the opening of the housing 121 to jointly define the internal environment of the battery cell 10 with the housing 121 and isolate the internal environment of the battery cell 10 from the external environment. Or, the housing 121 and the end cap 122 can also be an integrated structure. Specifically, a common connection surface can be formed between the end cap 122 and the housing 121 before the electrode assembly 11 enters the housing. When the electrode assembly 11 needs to be encapsulated after entering the housing, the end cap 122 is then covered on the housing 121.

[0116] Among them, the number of the end caps 122 can be one, as Figure 3 shown. Or, the number of the end caps 122 can also be two, and the two end caps 122 are respectively disposed at opposite ends of the housing 121, as Figure 5 shown.

[0117] Among them, the housing 121 can be in the shape of a cylinder, a square, etc., and can be specifically determined according to the specific shape and size of the electrode assembly 11. Moreover, the materials of the housing 121 and the end cap 122 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0118] Please refer to Figures 3 to 7 together and in combination with other attached drawings. Among them, Figure 4 in, a part of the positive electrode tab 111, a part of the negative electrode tab 112, and a part of the separator 113 are arranged in an unfolded manner. The outlines of the unfolded positive electrode tab 111 and the unfolded negative electrode tab 112 are drawn with dotted lines, and the sealing edge portion 1131 of the separator 113 is a shaded area. The battery cell 10 provided by the embodiment of the present application includes an electrode assembly 11, and the electrode assembly 11 includes a positive electrode tab 111, a negative electrode tab 112, and a separator 113. In some possible designs, please refer to Figure 7 , the positive electrode tab 111, the negative electrode tab 112, and the separator 113 are stacked to form a stacked structure of the electrode assembly 11; or, in some other possible designs, please refer to Figures 3 to 6 together, the positive electrode tab 111, the negative electrode tab 112, and the separator 113 are wound to form a wound structure of the electrode assembly 11. In this way, a separator 113 is provided between the positive electrode tab 111 and the negative electrode tab 112, so that the separator 113 can achieve insulation between the positive electrode tab 111 and the negative electrode tab 112. A part of the separator 113 extends beyond the edges of the positive electrode tab 111 and the negative electrode tab 112 to form a sealing edge portion 1131. At least part of the sealing edge portion 1131 is fixedly connected.

[0119] The sealing edge portion 1131 refers to a part of the separator 113, specifically the part of the separator 113 that extends beyond the edges of the positive electrode tab 111 and the negative electrode tab 112. It can be understood that the separator 113 includes a main body portion 1132 and a sealing edge portion 1131 connected to the main body portion 1132. At least part of the main body portion 1132 is disposed between the positive electrode tab 111 and the negative electrode tab 112 to achieve insulation between the positive electrode tab 111 and the negative electrode tab 112. Other parts of the separator 113 except the main body portion 1132 extend beyond the edges of the positive electrode tab 111 and the negative electrode tab 112 to form the sealing edge portion 1131. Among them, at least part of the main body portion 1132 of the separator 113 is disposed between the positive electrode tab 111 and the negative electrode tab 112, so that a separator 113 is provided between the positive electrode tab 111 and the negative electrode tab 112. Among them, the main body portion 1132 of the separator 113, the positive electrode tab 111, and the negative electrode tab 112 constitute the main structure a of the electrode assembly 11.

[0120] In some possible designs, the main body portion 1132 is only disposed between the positive electrode plate 111 and the negative electrode plate 112 to achieve insulation between the positive electrode plate 111 and the negative electrode plate 112. Alternatively, in some other possible designs, a part of the main body portion 1132 is disposed between the positive electrode plate 111 and the negative electrode plate 112 to achieve insulation between the positive electrode plate 111 and the negative electrode plate 112; another part of the main body portion 1132 is disposed on the outer side surface of the overall structure formed by the positive electrode plate 111 and the negative electrode plate 112, so as to wrap the overall structure formed by the positive electrode plate 111 and the negative electrode plate 112, which can improve the problem of electrical structure connection between the electrode assembly 11 and the outside, such as Figure 7 shown.

[0121] As an example, when the electrode assembly 11 is a stacked structure, a part of the main body portion 1132 is disposed between the positive electrode plate 111 and the negative electrode plate 112; along the stacking direction of the positive electrode plate 111 and the negative electrode plate 112, another part of the main body portion 1132 can be disposed on the opposite sides of the overall structure formed by the positive electrode plate 111 and the negative electrode plate 112, that is, both sides of the electrode assembly 11 along the stacking direction of the positive electrode plate 111 and the negative electrode plate 112 have the main body portion 1132 of the separator 113.

[0122] It should be noted here that both the positive electrode plate 111 and the negative electrode plate 112 are sheet-like structures. In this way, both the positive electrode plate 111 and the negative electrode plate 112 have four side edges. The edge of the positive electrode plate 111 refers to the side edge of the positive electrode plate 111. The edge of the negative electrode plate 112 refers to the side edge of the negative electrode plate 112.

[0123] In some possible designs, such as Figures 3 to 6As shown, the electrode assembly 11 has a wound structure. Specifically, the positive electrode plate 111, the negative electrode plate 112, and the separator 113 can be wound around the central axis L, and the central axis L is parallel to the first direction Z. The edge of the positive electrode plate 111 can include the edge of one end of the positive electrode plate 111 along the first direction Z or the edges of opposite ends, and can also include the edge of one end of the positive electrode plate 111 along the winding direction of the positive electrode plate 111 or the edges of opposite ends. Correspondingly, the edge of the negative electrode plate 112 can include the edge of one end of the negative electrode plate 112 along the first direction Z or the edges of opposite ends, and can also include the edge of one end of the negative electrode plate 112 along the winding direction of the negative electrode plate 112 or the edges of opposite ends. Among them, the winding directions of the positive electrode plate 111, the separator 113, and the negative electrode plate 112 are substantially the same, and can be collectively referred to as the winding direction of the electrode assembly 11. It can be understood that a part of the separator 113 extends beyond the edges of the positive electrode plate 111 and the negative electrode plate 112, which can include the case where a part of the separator 113 extends beyond the edges of one end or opposite ends of the positive electrode plate 111 and the negative electrode plate 112 along the first direction Z, and can also include the case where a part of the separator 113 extends beyond the edges of one end or opposite ends of the positive electrode plate 111 and the negative electrode plate 112 along the winding direction of the electrode assembly 11. That is, at least one of the four ends, namely the opposite ends of the positive electrode plate 111 and the negative electrode plate 112 along the first direction Z, and the opposite ends of the positive electrode plate 111 and the negative electrode plate 112 along the winding direction of the electrode assembly 11, can be provided with a sealing edge portion 1131. In other words, at least one of the opposite ends of the electrode assembly 11 along the first direction Z and the opposite ends of the electrode assembly 11 along the winding direction of the electrode assembly 11 has a sealing edge portion 1131. As an example, a part of the separator 113 extends beyond the edge of one end of the positive electrode plate 111 and the negative electrode plate 112 along the winding direction of the electrode assembly 11, so that in the winding direction of the electrode assembly 11, the separator 113 continues to wind after the positive electrode plate 111, the negative electrode plate 112, and the separator 113 are wound, that is, the electrode assembly 11 is arranged with the separator 113 at the end after winding.

[0124] In some other possible designs, such as Figure 7As shown, the electrode assembly 11 has a stacked structure. Specifically, the positive electrode sheet 111, the negative electrode sheet 112, and the separator 113 are stacked along the second direction Y. The edge of the positive electrode sheet 111 may include the edge of one end of the positive electrode sheet 111 along the first direction Z or the edges of opposite ends, and may also include the edge of one end of the positive electrode sheet 111 along the third direction X or the edges of opposite ends. The edge of the negative electrode sheet 112 may include the edge of one end of the negative electrode sheet 112 along the first direction Z or the edges of opposite ends, and may also include the edge of one end of the negative electrode sheet 112 along the third direction X or the edges of opposite ends. It can be understood that a part of the separator 113 extends beyond the edges of the positive electrode sheet 111 and the negative electrode sheet 112, which may include the case where a part of the separator 113 extends beyond the edges of one end or opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the first direction Z, and may also include the case where a part of the separator 113 extends beyond the edges of one end or opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the third direction X. That is, a sealing portion 1131 is provided outside the edges of at least one end of the opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the first direction Z, and the opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the third direction X. In other words, the sealing portion 1131 is provided at at least one end of the opposite ends of the electrode assembly 11 along the first direction Z and the opposite ends of the electrode assembly 11 along the third direction X.

[0125] Wherein, the second direction Y intersects with the first direction Z, the first direction Z intersects with the third direction X, and the second direction Y intersects with the third direction X. The intersection of the first direction Z and the second direction Y means that the first direction Z and the second direction Y can form an angle greater than 0° and less than 180°, that is, the first direction Z and the second direction Y are not parallel. The first direction Z and the second direction Y may be perpendicular to each other or not perpendicular. The first direction Z and the second direction Y may be directions intersecting on the same plane, or may be directions on planes that are skew to each other, and the projection of the second direction Y on the plane where the first direction Z is located may intersect with the first direction Z. Correspondingly, the meanings of the intersection of the first direction Z and the third direction X and the intersection of the second direction Y and the third direction X can be similarly explained and will not be repeated here. As an example, the first direction Z is perpendicular to the second direction Y, the first direction Z is perpendicular to the third direction X, and the second direction Y is perpendicular to the third direction X. In some cases, the first direction Z may be the length direction or the height direction of the battery cell 10, the second direction Y may be the thickness direction of the battery cell 10, and the third direction X may be the width direction of the battery cell 10.

[0126] At least a part of the edge-sealing part 1131 is fixedly connected, which means that among all the edge-sealing parts 1131 of the electrode assembly 11, a part of the edge-sealing parts 1131 are fixedly connected; or all the edge-sealing parts 1131 are fixedly connected. Specifically, among the four ends of the electrode assembly 11 at the opposite ends along the first direction Z and the opposite ends along the winding direction of the electrode assembly 11, or among the four ends of the electrode assembly 11 at the opposite ends along the first direction Z and the opposite ends along the third direction X: at least one end of the electrode assembly 11 has an edge-sealing part 1131. When only one end of the electrode assembly 11 has an edge-sealing part 1131, the edge-sealing part 1131 at this end is fixedly connected. When multiple ends of the electrode assembly 11 have edge-sealing parts 1131, the edge-sealing parts 1131 at each end of the electrode assembly 11 are all fixedly connected, as Figures 4 to 7 shown; or, the edge-sealing parts 1131 at some ends of the electrode assembly 11 are fixedly connected, and the edge-sealing parts 1131 at some other ends of the electrode assembly 11 are not fixedly connected. Among them, when the edge-sealing parts 1131 at multiple ends of the electrode assembly 11 are fixedly connected, the edge-sealing parts 1131 at each end of the electrode assembly 11 are fixedly connected separately; or, the edge-sealing parts 1131 at at least two ends of the electrode assembly 11 are fixedly connected together. For example, the edge-sealing parts 1131 at adjacent ends of the electrode assembly 11 are fixedly connected together.

[0127] For example, as Figure 4 and Figure 6 shown, the electrode assembly 11 is a winding structure, and both opposite ends of the electrode assembly 11 along the first direction Z have edge-sealing parts 1131. As an example, as Figure 4 and Figure 6 shown, the edge-sealing parts 1131 at each end of the electrode assembly 11 are all fixedly connected; as another example, the edge-sealing part 1131 at one end of the electrode assembly 11 is fixedly connected, and the edge-sealing part 1131 at the other end of the electrode assembly 11 is not fixedly connected. Among them, the edge-sealing part 1131 at one end of the electrode assembly 11 and the edge-sealing part 1131 at the other end of the electrode assembly 11 can be fixedly connected separately or can be fixed together.

[0128] Again, for example, as Figure 7 shown, the electrode assembly 11 is a stacked structure, and all four ends of the electrode assembly 11 at the opposite ends along the first direction Z and the opposite ends along the third direction X have edge-sealing parts 1131. As an example, as Figure 7As shown, the edge sealing parts 1131 at each end of the electrode assembly 11 are fixedly connected; as another example, the edge sealing parts 1131 at some ends of the electrode assembly 11 are fixedly connected, and the edge sealing parts 1131 at some other ends of the electrode assembly 11 are not fixedly connected. Among them, when the edge sealing parts 1131 at multiple ends of the electrode assembly 11 are fixedly connected, the edge sealing parts 1131 at each end of the electrode assembly 11 are fixedly connected separately, or the edge sealing parts 1131 at at least two ends of the electrode assembly 11 are fixedly connected together.

[0129] By fixedly connecting at least part of the edge sealing parts 1131, the positions of at least part of the edge sealing parts 1131 are fixed to a certain extent, so that the insulating effect between the positive electrode plate 111 and the negative electrode plate 112 by the separator 113 can be maintained. For example, the edge sealing parts 1131 formed by the separators 113 on the opposite sides of the positive electrode plate 111 are fixedly connected, so that the edge sealing parts 1131 formed by the separators 113 on the opposite sides of the positive electrode plate 111 can stably and firmly wrap the positive electrode plate 111, so that the separator 113 can stably isolate the positive electrode plate 111 from the adjacent negative electrode plate 112, and further can prevent the problem that the positive electrode plate 111 and the adjacent negative electrode plate 112 are overlapped to a certain extent. Another example is that the edge sealing parts 1131 formed by the separators 113 on the opposite sides of the negative electrode plate 112 are fixedly connected, so that the edge sealing parts 1131 formed by the separators 113 on the opposite sides of the negative electrode plate 112 can stably and firmly wrap the negative electrode plate 112, so that the separator 113 can stably isolate the negative electrode plate 112 from the adjacent positive electrode plate 111, and further can prevent the problem that the negative electrode plate 112 and the adjacent positive electrode plate 111 are overlapped to a certain extent.

[0130] In the battery cell 10 provided by the embodiment of the present application, by making at least part of the separator 113 extend beyond the edges of the positive electrode plate 111 and the negative electrode plate 112 to form the edge sealing parts 1131, and at least part of the edge sealing parts 1131 are fixedly connected, so that at least part of the separator 113 is fixedly connected outside the edges of the positive electrode plate 111 and the negative electrode plate 112, and further the position of at least part of the separator 113 can be fixed to a certain extent. In this way, the separator 113 can stably and firmly wrap the positive electrode plate 111 and the negative electrode plate 112 to isolate the positive electrode plate 111 and the negative electrode plate 112, realize the insulation between the positive electrode plate 111 and the negative electrode plate 112, thereby improving the problem that the positive electrode plate 111 and the negative electrode plate 112 are overlapped due to the folding of the separator 113, and further improving the reliability of the battery cell 10.

[0131] In addition, at least a part of the separator 113 is fixedly connected outside the edges of the positive electrode plate 111 and the negative electrode plate 112 to enhance the insulation protection of the separator 113 between the positive electrode plate 111 and the negative electrode plate 112. In this way, the step of compounding and fixing the separator 113 to the positive electrode plate 111 can be omitted, and the step of compounding and fixing the separator 113 to the negative electrode plate 112 can also be omitted. Based on this, on the one hand, the problem that the air permeability of the separator 113 deteriorates due to the compounding and fixing of the separator 113 to the positive electrode plate 111 and the compounding and fixing of the separator 113 to the negative electrode plate 112 can be improved. Thus, the problem that the ion conduction ability of the separator 113 deteriorates due to the poor air permeability of the separator 113 can be improved, and further, the ion conduction ability of the separator 113 can be enhanced to improve the charge and discharge performance of the battery cell 10, and further improve the kinetic performance of the battery cell 10. On the other hand, the problem that the adhesion performance of the separator 113 deteriorates due to the compounding and fixing of the separator 113 to the positive electrode plate 111 and the compounding and fixing of the separator 113 to the negative electrode plate 112 can also be improved. Thus, the problem that the electrode assembly 11 cannot be firmly fixed together after shaping due to the poor adhesion performance of the separator 113 and is prone to dispersion can be improved. In this way, the structural integrity of the electrode assembly 11 can be enhanced, and further, it helps to improve the charge and discharge performance of the battery cell 10 to improve the kinetic performance of the battery cell 10.

[0132] In some embodiments, please refer to Figure 4 、 Figures 6 to 9 together and in combination with other drawings. Among them, Figure 8 is Figure 6 a cross-sectional view along A-A, Figure 9 and Figure 8 is a schematic diagram of the edge sealing portion 1131 of

[0133] before fixation. The edge sealing portions 1131 located outside the edges of the same end of the positive electrode plate 111 and the negative electrode plate 112 are fixedly connected.

[0134] It can be understood that the edge sealing portions 1131 of the same end of the electrode assembly 11 are fixedly connected together. Among them, when only one end of the electrode assembly 11 has an edge sealing portion 1131, the edge sealing portion 1131 is fixedly connected together. When multiple ends of the electrode assembly 11 have edge sealing portions 1131, among the multiple edge sealing portions 1131, only the edge sealing portion 1131 of one end is fixedly connected together; or, at least two ends of the edge sealing portions 1131 are fixedly connected, and the edge sealing portions 1131 of the same end are fixedly connected to each other.

[0135] As an example, when the electrode assembly 11 is a wound structure, such as Figure 4 and Figure 6 shown, both opposite ends of the electrode assembly 11 along the first direction Z have edge sealing portions 1131. Only the edge sealing portion 1131 at one end of the electrode assembly 11 is fixedly connected; alternatively, the edge sealing portions 1131 at both opposite ends of the electrode assembly 11 are respectively fixed.

[0136] As another example, when the electrode assembly 11 is a stacked structure, such as Figure 7 shown, both opposite ends of the electrode assembly 11 along the first direction Z and both opposite ends of the electrode assembly 11 along the third direction X have edge sealing portions 1131. Only the edge sealing portion 1131 at one end of the electrode assembly 11 is fixedly connected; alternatively, the edge sealing portions 1131 at at least two ends of the electrode assembly 11 are respectively fixed.

[0137] By fixedly connecting through the edge sealing portion 1131 located outside the edges at the same end of the positive electrode tab 111 and the negative electrode tab 112, such that among the same end of the electrode assembly 11, the edge sealing portions 1131 formed by the separators 113 on both opposite sides of any one positive electrode tab 111 are fixedly connected, thereby realizing the wrapping of this positive electrode tab 111. And, the edge sealing portions 1131 formed by the separators 113 on both opposite sides of any one negative electrode tab 112 are fixedly connected, thereby realizing the wrapping of this negative electrode tab 112. Thus, the edge sealing portions 1131 at each end can realize the wrapping of the positive electrode tab 111 and the negative electrode tab 112 at the corresponding end, so that the separator 113 can stably realize insulation between the positive electrode tab 111 and the negative electrode tab 112, thereby improving the problem of the overlap of the positive electrode tab 111 and the negative electrode tab 112 at the corresponding end. For example, as Figure 8 and Figure 9 shown, the edge sealing portion 1131 at one end (left end) of the electrode assembly 11 along the first direction Z is fixedly connected alone to realize the wrapping and insulation of the positive electrode tab 111 and the negative electrode tab 112 at one end along the first direction Z, and improve the problem of the overlap of the positive electrode tab 111 and the negative electrode tab 112 at one end along the first direction Z. The edge sealing portion 1131 at the other end (right end) of the electrode assembly 11 along the first direction Z is also fixedly connected alone to realize the wrapping and insulation of the positive electrode tab 111 and the negative electrode tab 112 at the other end along the first direction Z, and improve the problem of the overlap of the positive electrode tab 111 and the negative electrode tab 112 at the other end along the first direction Z.

[0138] In some embodiments, please refer to Figure 10 and Figure 11 together, and in combination with other drawings. Among them, Figure 10 is Figure 6 a side view of the electrode assembly 11 provided in some embodiments, Figure 11 is Figure 6Side view of the provided electrode assembly 11 in some other embodiments. Figure 10 and Figure 11 Side view of the provided electrode assembly 11, specifically a schematic view of the electrode assembly 11 from the perspective of the first direction Z, specifically Figure 6 left view. Among them, Figure 10 and Figure 11 in, the shaded area is the fixed area m. A fixed area m is fixedly formed at the edge outside the same end of the positive electrode tab 111 and the negative electrode tab 112. And, the fixed area m located outside the edge of the same end of the positive electrode tab 111 and the negative electrode tab 112 is continuously arranged, as Figure 10 shown; or, the fixed area m located outside the same end of the positive electrode tab 111 and the negative electrode tab 112 is arranged at intervals, as Figure 11 shown.

[0139] The fixed area m refers to the area where the edge sealing part 1131 is fixedly connected, that is, the specific position where the edge sealing part 1131 is fixedly connected.

[0140] The fixed area m located outside the edge of the same end of the positive electrode tab 111 and the negative electrode tab 112 is continuously arranged, which means that there is one fixed area m at the same end of the electrode assembly 11.

[0141] The fixed area m located outside the edge of the same end of the positive electrode tab 111 and the negative electrode tab 112 is arranged at intervals, which means that the fixed area m at the same end of the electrode assembly 11 is arranged in multiple, and the multiple fixed areas m are distributed at intervals.

[0142] Such a setting makes the fixing operation of the edge sealing part 1131 very flexible.

[0143] In addition, by arranging the fixed area m located outside the edge of the same end of the positive electrode tab 111 and the negative electrode tab 112 at intervals, it is convenient for the electrolyte to infiltrate from the edge sealing part 1131 to the middle position of the electrode assembly 11, thereby improving the infiltration efficiency of the electrode assembly 11.

[0144] Among them, the fixed area m can be in the shape of a square, a circle, a triangle, etc.

[0145] In some embodiments, please refer to Figures 4 to 7 , and in combination with other drawings. In some possible designs, as Figure 4 shown, one end of the electrode assembly 11 along the first direction Z is provided with a positive electrode tab 114 and a negative electrode tab 115 at intervals; or, in some other possible designs, as Figures 5 to 7As shown, at the opposite ends of the electrode assembly 11 along the first direction Z, a positive electrode tab 114 and a negative electrode tab 115 are respectively provided. The positive electrode tab 114 is connected to the positive electrode plate 111, and the negative electrode tab 115 is connected to the negative electrode plate 112. At least one end of the positive electrode plate 111 and the negative electrode plate 112 along the first direction Z is provided with a sealing edge portion 1131.

[0146] It can be understood that the electrode assembly 11 further includes a positive electrode tab 114 and a negative electrode tab 115. As Figure 4 shown, the positive electrode tab 114 and the negative electrode tab 115 are spaced apart and provided at one end of the electrode assembly 11 along the first direction Z; or, as Figures 5 to 7 shown, the positive electrode tab 114 and the negative electrode tab 115 are respectively provided at the opposite ends of the electrode assembly 11 along the first direction Z. It can also be understood that the main body portions 1132 of the positive electrode plate 111, the negative electrode plate 112, and the separator 113 are stacked or wound to form a main structure a. As Figure 4 shown, the positive electrode tab 114 and the negative electrode tab 115 are spaced apart and provided at one end of the main structure a along the first direction Z; or, as Figures 5 to 7 shown, the positive electrode tab 114 and the negative electrode tab 115 are respectively provided at the opposite ends of the main structure a along the first direction Z.

[0147] The positive electrode tab 114 is connected to the positive electrode plate 111 so that the positive electrode tab 114 is electrically connected to the positive electrode plate 111, such that the positive electrode tab 114 can serve as the current transmission end of the positive electrode plate 111. The negative electrode tab 115 is connected to the negative electrode plate 112 so that the negative electrode tab 115 is electrically connected to the negative electrode plate 112, such that the negative electrode tab 115 can serve as the current transmission end of the negative electrode plate 112.

[0148] That at least one end of the positive electrode plate 111 and the negative electrode plate 112 along the first direction Z is provided with a sealing edge portion 1131 means that a sealing edge portion 1131 is provided at at least one end of the electrode assembly 11 along the first direction Z, and it can also be understood that a sealing edge portion 1131 is connected to at least one end of the main structure a along the first direction Z.

[0149] Based on this, when a sealing edge portion 1131 is provided at one end of the electrode assembly 11 along the first direction Z, the sealing edge portion 1131 can be fixedly connected. When sealing edge portions 1131 are provided at both opposite ends of the electrode assembly 11 along the first direction Z, the sealing edge portions 1131 at the opposite ends of the electrode assembly 11 along the first direction Z can be fixedly connected separately; or, the sealing edge portion 1131 at one end of the electrode assembly 11 along the first direction Z is fixedly connected.

[0150] With such a setting, the edge sealing part 1131 outside at least one end of the positive electrode tab 111 and the negative electrode tab 112 along the first direction Z can be fixedly connected, so that the separator 113 can wrap the positive electrode tab 111 and the negative electrode tab 112 at at least one end of the electrode assembly 11 along the first direction Z, thereby improving the problem of the overlap of the positive electrode tab 111 and the negative electrode tab 112 at at least one end along the first direction Z.

[0151] Here, it should be supplemented that in some possible designs, such as Figure 4 As shown, when the positive electrode ear 114 and the negative electrode ear 115 are spaced apart at one end of the electrode assembly 11 along the first direction Z: When there is an edge sealing part 1131 at one end of the electrode assembly 11 along the first direction Z, the edge sealing part 1131 can be arranged at the end of the electrode assembly 11 without the positive electrode ear 114 and the negative electrode ear 115; the edge sealing part 1131 can also be arranged at the end of the electrode assembly 11 with the positive electrode ear 114 and the negative electrode ear 115. In this way, after the edge sealing part 1131 is fixedly connected, it can block the positive electrode ear 114 and the negative electrode ear 115, thereby improving the problem that the electrode assembly 11 self-discharges due to the positive electrode ear 114 bending and contacting the negative electrode tab 112, and can also improve the problem that the electrode assembly 11 self-discharges due to the negative electrode ear 115 bending and contacting the positive electrode tab 111. When the electrode assembly 11 has edge sealing parts 1131 at opposite ends along the first direction Z, as Figure 4 As shown, the edge sealing part 1131 at one end can block the positive electrode ear 114 and the negative electrode ear 115 after being fixedly connected, thereby improving the problem that the electrode assembly 11 self-discharges due to the positive electrode ear 114 bending and contacting the negative electrode tab 112, and can also improve the problem that the electrode assembly 11 self-discharges due to the negative electrode ear 115 bending and contacting the positive electrode tab 111.

[0152] In other possible designs, such as Figures 5 to 7 As shown, when the positive electrode ear 114 and the negative electrode ear 115 are respectively arranged at opposite ends of the electrode assembly 11 along the first direction Z: When there is an edge sealing part 1131 at one end of the electrode assembly 11 along the first direction Z, the edge sealing part 1131 can be located at the end of the electrode assembly 11 with the positive electrode ear 114. In this way, after being fixedly connected, it can block the positive electrode ear 114, thereby improving the problem that the electrode assembly 11 self-discharges due to the positive electrode ear 114 bending and contacting the negative electrode tab 112; the edge sealing part 1131 can also be located at the end of the electrode assembly 11 with the negative electrode ear 115. In this way, after being fixedly connected, it can block the negative electrode ear 115, thereby improving the problem that the electrode assembly 11 self-discharges due to the negative electrode ear 115 bending and contacting the positive electrode tab 111. When the electrode assembly 11 has edge sealing parts 1131 at opposite ends along the first direction Z, as Figures 5 to 7As shown, the edge sealing part 1131 at one end can block the positive electrode tab 114 after fixed connection, so as to improve the problem that the positive electrode tab 114 contacts the negative electrode plate 112 after bending, resulting in self-discharge of the electrode assembly 11; the edge sealing part 1131 at the other end can block the negative electrode tab 115 after fixed connection, so as to improve the problem that the negative electrode tab 115 contacts the positive electrode plate 111 after bending, resulting in self-discharge of the electrode assembly 11.

[0153] In some embodiments, please refer to Figures 4 to 7 and, in combination with other drawings. Edge sealing parts 1131 are provided outside the opposite ends of the positive electrode plate 111 and the negative electrode plate 112 along the first direction Z, and the edge sealing parts 1131 located outside each end of the positive electrode plate 111 and the negative electrode plate 112 along the first direction Z are fixedly connected.

[0154] It can be understood that edge sealing parts 1131 are provided at the opposite ends of the electrode assembly 11 along the first direction Z, and among the edge sealing parts 1131 at the opposite ends of the electrode assembly 11 along the first direction Z, the edge sealing parts 1131 at each end are fixedly connected.

[0155] With such a setting, the separator 113 can be fixedly connected at the opposite ends of the electrode assembly 11 along the first direction Z, so as to wrap the positive electrode plate 111 and the negative electrode plate 112 at the opposite ends of the electrode assembly 11 along the first direction Z. In this way, the problem of the positive electrode plate 111 and the negative electrode plate 112 overlapping at the opposite ends along the first direction Z can be improved.

[0156] In some embodiments, please refer to Figure 4 and, in combination with other drawings. The positive electrode tab 114 and the negative electrode tab 115 are arranged at intervals at one end of the electrode assembly 11 along the first direction Z. Along the first direction Z, an edge sealing part 1131 is provided outside the end of the positive electrode plate 111 and the negative electrode plate 112 where the positive electrode tab 114 and the negative electrode tab 115 are located. And, along the first direction Z, the edge sealing part 1131 outside the end of the positive electrode plate 111 and the negative electrode plate 112 where the positive electrode tab 114 and the negative electrode tab 115 are located is fixedly connected and fixed to the positive electrode tab 114; or, along the first direction Z, the edge sealing part 1131 outside the end of the positive electrode plate 111 and the negative electrode plate 112 where the positive electrode tab 114 and the negative electrode tab 115 are located is fixedly connected and fixed to the negative electrode tab 115; or, as Figure 4 shown, along the first direction Z, the edge sealing part 1131 outside the end of the positive electrode plate 111 and the negative electrode plate 112 where the positive electrode tab 114 and the negative electrode tab 115 are located is fixedly connected and fixed to the positive electrode tab 114 and the negative electrode tab 115.

[0157] The sealing edge portion 1131 outside one end of the positive electrode tab 114 and the negative electrode tab 115 of the positive electrode plate 111 and the negative electrode plate 112 is fixedly connected and fixed to the positive electrode tab 114, which can improve the problem that the positive electrode tab 114 overlaps the negative electrode plate 112 after being bent. The sealing edge portion 1131 outside one end of the positive electrode tab 114 and the negative electrode tab 115 of the positive electrode plate 111 and the negative electrode plate 112 is fixedly connected and fixed to the negative electrode tab 115, which can improve the problem that the negative electrode tab 115 overlaps the positive electrode plate 111 after being bent. The sealing edge portion 1131 outside one end of the positive electrode tab 114 and the negative electrode tab 115 of the positive electrode plate 111 and the negative electrode plate 112 is fixedly connected and fixed to the positive electrode tab 114 and the negative electrode tab 115, which can improve the problem that the positive electrode tab 114 overlaps the negative electrode plate 112 and the negative electrode tab 115 overlaps the positive electrode plate 111.

[0158] In some embodiments, please refer to Figures 5 to 7 and in combination with other drawings. The positive electrode tab 114 and the negative electrode tab 115 are respectively arranged at opposite ends of the electrode assembly 11 along the first direction Z, and sealing edge portions 1131 are provided outside opposite ends of the positive electrode plate 111 and the negative electrode plate 112 along the first direction Z. In some possible designs, the sealing edge portion 1131 outside one end of the positive electrode plate 111 and the negative electrode plate 112 having the positive electrode tab 114 is fixedly connected and fixed to the positive electrode tab 114; or, in some other possible designs, the sealing edge portion 1131 outside one end of the positive electrode plate 111 and the negative electrode plate 112 having the negative electrode tab 115 is fixedly connected and fixed to the negative electrode tab 115; or, in still some other possible designs, the sealing edge portion 1131 outside one end of the positive electrode plate 111 and the negative electrode plate 112 having the positive electrode tab 114 is fixedly connected and fixed to the positive electrode tab 114, and the sealing edge portion 1131 outside one end of the positive electrode plate 111 and the negative electrode plate 112 having the negative electrode tab 115 is fixedly connected and fixed to the negative electrode tab 115.

[0159] It can be understood that the positive electrode tab 114 and the negative electrode tab 115 are respectively arranged at opposite ends of the electrode assembly 11 along the first direction Z, and sealing edge portions 1131 are provided at opposite ends of the electrode assembly 11 along the first direction Z.

[0160] The sealing edge portion 1131 at one end of the electrode assembly 11 along the first direction Z is fixedly connected and fixed to the positive electrode tab 114; the sealing edge portion 1131 at the other end of the electrode assembly 11 along the first direction Z is fixedly connected and fixed to the negative electrode tab 115. Or, the sealing edge portion 1131 at one end of the electrode assembly 11 along the first direction Z is fixedly connected and fixed to the positive electrode tab 114. Or, the sealing edge portion 1131 at one end of the electrode assembly 11 along the first direction Z is fixedly connected and fixed to the negative electrode tab 115.

[0161] It is fixedly connected through the edge sealing part 1131 and fixed to the positive electrode tab 114, which can improve the problem of self-discharge of the electrode assembly 11 caused by the positive electrode tab 114 lapping on the negative electrode plate 112. It is fixedly connected through the edge sealing part 1131 and fixed to the negative electrode tab 115, which can improve the problem of self-discharge of the electrode assembly 11 caused by the negative electrode tab 115 lapping on the positive electrode plate 111.

[0162] Moreover, by arranging the positive electrode tab 114 and the negative electrode tab 115 at opposite ends of the electrode assembly 11 along the first direction Z, the battery cell 10 can be provided with a liquid injection hole at at least one end in the direction perpendicular to the first direction Z. In this way, when injecting the electrolyte, the battery cell 10 is in a lying state with the first direction Z parallel to the horizontal plane. For example, the electrode assembly 11 is in Figure 6 the state shown in the figure. At this time, the liquid injection hole is located above the electrode assembly 11. Based on this, after the electrolyte is injected into the battery cell 10, since the separator 113 extends beyond the opposite ends of the positive electrode plate 111 and the negative electrode plate 112 along the first direction Z to form the edge sealing part 1131, the electrolyte can infiltrate into the edge sealing part 1131 at the opposite ends of the electrode assembly 11 along the first direction Z, and then infiltrate upward and gradually infiltrate toward the middle position of the electrode assembly 11 along the first direction Z. In this way, it helps to improve the infiltration speed and infiltration amount of the electrolyte, thereby improving the electrolyte infiltration of the battery cell 10 and the cycle performance of the battery cell 10.

[0163] In some embodiments, please refer to Figure 7 and Figure 12 together, and in combination with other drawings. Among them, Figure 12 is Figure 7 a cross-sectional view along B-B. The positive electrode plate 111, the negative electrode plate 112, and the separator 113 are stacked along the second direction Y so that the electrode assembly 11 is a stacked structure. Edge sealing parts 1131 are provided outside at least one end of the positive electrode plate 111 and the negative electrode plate 112 along the third direction X. Among them, the first direction Z and the second direction Y intersect, the first direction Z and the third direction X intersect each other, and the second direction Y and the third direction X intersect.

[0164] It can be understood that as Figure 12 shown, the positive electrode plate 111 and the negative electrode plate 112 are alternately stacked along the second direction Y, and a separator 113 is stacked between any adjacent positive electrode plate 111 and negative electrode plate 112 in the second direction Y. That is, in the second direction Y, the electrode assembly 11 is mainly stacked in the order of the positive electrode plate 111, the separator 113, the negative electrode tab 115, the separator 113, the positive electrode plate 111...

[0165] In some possible designs, one end of the electrode assembly 11 along the third direction X is provided with a sealing edge portion 1131, and the sealing edge portion 1131 can be fixedly connected. In other possible designs, sealing edge portions 1131 are provided at opposite ends of the electrode assembly 11 along the third direction X, and the sealing edge portions 1131 at opposite ends of the electrode assembly 11 along the third direction X can be fixedly connected separately; or, the sealing edge portion 1131 at one end of the electrode assembly 11 along the third direction X is fixedly connected.

[0166] With such an arrangement, the sealing edge portions 1131 outside at least one end of the positive electrode tab 111 and the negative electrode tab 112 along the third direction X can be fixedly connected, so that the separator 113 can wrap the positive electrode tab 111 and the negative electrode tab 112 at least at one end of the electrode assembly 11 along the third direction X, thereby improving the problem of overlap of the positive electrode tab 111 and the negative electrode tab 112 at at least one end in the third direction X.

[0167] In some embodiments, please refer to Figure 7 and Figure 12 together with other drawings. Sealing edge portions 1131 are provided outside opposite ends of the positive electrode tab 111 and the negative electrode tab 112 along the third direction X, and the sealing edge portions 1131 outside each end of the positive electrode tab 111 and the negative electrode tab 112 along the third direction X are fixedly connected.

[0168] It can be understood that sealing edge portions 1131 are provided at opposite ends of the electrode assembly 11 along the third direction X, and among the sealing edge portions 1131 at opposite ends of the electrode assembly 11 along the third direction X, the sealing edge portions 1131 at each end are fixedly connected.

[0169] With such an arrangement, the separator 113 can be fixedly connected at opposite ends of the electrode assembly 11 along the third direction X to wrap the positive electrode tab 111 and the negative electrode tab 112 at opposite ends of the electrode assembly 11 along the third direction X. In this way, the problem of overlap of the positive electrode tab 111 and the negative electrode tab 112 at opposite ends in the third direction X can be improved.

[0170] In some embodiments, the sealing edge portion 1131 is fixed by heat sealing.

[0171] Heat sealing means sealing the edge by heating. It can be understood that after the positive electrode tab 111, the negative electrode tab 112 and the separator 113 form the electrode assembly 11, the sealing edge portion 1131 can be heated so that the sealing edge portion 1131 melts and is fixedly connected after heating.

[0172] Alternatively, in other embodiments, the separator 113 is provided with an adhesive layer at the sealing edge portion 1131, and the sealing edge portion 1131 is fixedly connected through the adhesive layer.

[0173] The adhesive layer refers to a layer structure with adhesive ability, which can be but is not limited to an adhesive layer with bonding ability.

[0174] On at least one side of the opposite sides of the separator 113, an adhesive layer can be provided, and the adhesive layer is located at the edge sealing of the separator 113. In this way, when the separator 113, the positive electrode plate 111, and the negative electrode plate 112 form the electrode assembly 11, the edge sealing portion 1131 can be adhesively fixed through the adhesive layer.

[0175] With such a setting, there are more operation methods for fixedly connecting the edge sealing portion 1131, and the flexibility is higher.

[0176] Please refer to Figure 2 and in combination with other drawings. The battery 100 provided by the embodiment of the present application includes a battery cell 10. Among them, the battery cell 10 in this embodiment is the same as the battery cell 10 in the previous embodiment. For specific details, please refer to the relevant description of the battery cell 10 in the previous embodiment, which will not be elaborated here.

[0177] The battery 100 provided by the embodiment of the present application, by adopting the battery cell 10 involved above, can improve the problem that the positive electrode plate 111 and the negative electrode plate 112 overlap due to the folding of the separator 113, so as to improve the reliability of the battery cell 10, and further improve the reliability of the battery 100.

[0178] Please refer to Figure 1 The electrical device provided by the embodiment of the present application includes the battery cell 10 or the battery 100. Among them, the battery cell 10 and the battery 100 in this embodiment are the same as the battery cell 10 and the battery 100 in the previous embodiment. For specific details, please refer to the relevant description of the battery cell 10 and the battery 100 in the previous embodiment, which will not be elaborated here.

[0179] The electrical device provided by the embodiment of the present application, by adopting the battery cell 10 or the battery 100 involved above, can improve the reliability of the battery cell 10, so as to improve the reliability of the battery 100, and further improve the reliability of the electrical device.

[0180] Please refer to Figure 13 and in combination with other drawings. Among them, Figure 13 is a schematic diagram of the battery processing equipment 2000 provided by some embodiments of the present application. The battery processing equipment 2000 provided by the embodiment of the present application is applied to the battery cell 10. It can be understood that the battery processing equipment 2000 is used to process the battery cell 10. Among them, the battery cell 10 in this embodiment is the same as the battery cell 10 in the previous embodiment. For specific details, please refer to the relevant description of the battery cell 10 in the previous embodiment, which will not be elaborated here.

[0181] The battery processing device 2000 provided by the embodiment of the present application includes a sealing device 2100, and the sealing device 2100 is used to fixedly connect at least part of the sealing part 1131 that extends beyond the edges of the positive electrode plate 111 and the negative electrode plate 112 of the separator 113.

[0182] The sealing device 2100 refers to a device for fixedly connecting the sealing part 1131 of the separator 113.

[0183] As an example, the sealing device 2100 can be, but is not limited to, a resistive heating device. By energizing, the sealing device 2100 can heat the sealing part 1131, so that the sealing part 1131 is heat-sealed and fixed.

[0184] For the battery processing device 2000 provided by the embodiment of the present application, by setting the sealing device 2100, at least part of the sealing part 1131 that extends beyond the edges of the positive electrode plate 111 and the negative electrode plate 112 of the separator 113 can be fixed, so that at least part of the separator 113 is fixedly connected outside the edges of the positive electrode plate 111 and the negative electrode plate 112, and further, the position of at least part of the separator 113 can be fixed to a certain extent. In this way, the separator 113 can stably and reliably wrap the positive electrode plate 111 and the negative electrode plate 112 to isolate the positive electrode plate 111 and the negative electrode plate 112, realizing insulation between the positive electrode plate 111 and the negative electrode plate 112, thereby improving the problem of the positive electrode plate 111 and the negative electrode plate 112 being overlapped due to the folding of the separator 113, and further improving the reliability of the battery cell 10.

[0185] In some embodiments, please refer to Figures 13 to 15 together and in combination with other drawings. Figure 14 is a schematic diagram of the sealing device 2100 of the battery processing device 2000 provided by some embodiments of the present application. Figure 15 is a schematic diagram of the sealing device 2100 of the battery processing device 2000 provided by other embodiments of the present application. The sealing device 2100 includes a connecting member 2110 and a heating member 2120. The heating member 2120 is arranged on the connecting member 2110 and is used to heat the sealing part 1131 to fix the sealing part 1131.

[0186] The heating member 2120 refers to a component for heating, and the connecting member 2110 refers to a component for connecting the heating member 2120. Among them, the heating member 2120 can be, but is not limited to, a heating resistor.

[0187] Specifically, during operation, the connecting member 2110 can be driven to move, so that the heating member 2120 moves to the sealing part 1131 under the drive of the connecting member 2110. In this way, the sealing part 1131 can be heated by the heating member 2120, so as to realize the heat-sealing and fixing of the sealing part 1131.

[0188] With such a setting, heat sealing and fixing of the edge sealing part 1131 can be achieved.

[0189] In some embodiments, referring to Figure 14 , and in combination with other drawings, the edge sealing device 2100 includes a heating member 2120.

[0190] With such a setting, when the edge sealing device 2100 heats the edge sealing part 1131 at the same end of the electrode assembly 11, the heating member 2120 of the edge sealing device 2100 can be brought into contact with the edge sealing part 1131 at the same end of the electrode assembly 11. In this way, the edge sealing part 1131 at the same end of the electrode assembly 11 can be heated and fixed to form a fixed area m, that is, the fixed areas m at the same end of the electrode assembly 11 are continuously arranged.

[0191] Alternatively, in some other embodiments, referring to Figure 15 , and in combination with other drawings. The edge sealing device 2100 includes a plurality of heating members 2120, and the plurality of heating members 2120 are arranged at intervals on one side of the connecting member 2110.

[0192] With such a setting, when the edge sealing device 2100 heats the edge sealing part 1131 at the same end of the electrode assembly 11, the plurality of spaced-apart heating members 2120 of the edge sealing device 2100 can be brought into contact with the edge sealing part 1131 at the same end of the electrode assembly 11, and each heating member 2120 can heat and fix the edge sealing part 1131 to form each fixed area m. In this way, the edge sealing part 1131 at the same end of the electrode assembly 11 can be heated and fixed to form a plurality of spaced-apart fixed areas m, that is, the fixed areas m at the same end of the electrode assembly 11 are arranged at intervals.

[0193] It should be supplemented here that when heat-sealing the edge sealing part 1131, the edge sealing part 1131 at the same end of the electrode assembly 11 can be heat-sealed and fixed by one edge sealing device 2100, or the edge sealing part 1131 at the same end of the electrode assembly 11 can be heat-sealed and fixed by a plurality of edge sealing devices 2100.

[0194] As an example, as Figure 12 shown, two edge sealing devices 2100 can be respectively located on opposite sides of the electrode assembly 11 along the second direction Y, so that the two edge sealing devices 2100 respectively heat-seal the opposite sides of the edge sealing part 1131 at the same end of the electrode assembly 11 in the second direction Y, so that after heat-sealing and fixing, the edge sealing part 1131 can be located at the middle position of the electrode assembly 11 along the second direction Y.

[0195] It should also be supplemented here that after the positive electrode sheet 111, the negative electrode sheet 112, and the separator 113 are stacked or wound to form the electrode assembly 11, the sealing portion 1131 of the separator 113 is heat-sealed and fixed by the edge-sealing device 2100.

[0196] In some embodiments, please refer to Figure 13 , and in combination with other drawings. The battery processing device 2000 further includes an assembling device 2200 and a stacking device 2300. The assembling device 2200 is used to assemble the electrode assembly 11 to form the battery cell 10. The stacking device 2300 is used to stack a plurality of battery cells 10 to form the battery 100.

[0197] The assembling device 2200 refers to a device for assembling the electrode assembly 11 to form the battery cell 10, and the stacking device 2300 refers to a device for stacking a plurality of battery cells 10 to form the battery 100.

[0198] It can be understood that when the battery processing device 2000 is working, the sealing portion 1131 of the electrode assembly 11 can be heat-sealed and fixed by the edge-sealing device 2100; then, the electrode assembly 11, the housing 121, the end cap 122, etc. are assembled by the assembling device 2200 to form the battery cell 10; finally, a plurality of battery cells 10 are stacked by the stacking device 2300 to form the battery 100.

[0199] By setting like this, the battery 100 can be obtained.

[0200] In some embodiments, please continue to refer to Figure 13 , and in combination with other drawings. The battery processing device 2000 may further include a winding device 2400, and the winding device 2400 refers to a device for winding the positive electrode sheet 111, the negative electrode sheet 112, and the separator 113 to form the electrode assembly 11.

[0201] Specifically, the winding device 2400 winds the positive electrode sheet 111, the negative electrode sheet 112, and the separator 113, so as to obtain the electrode assembly 11 with a wound structure.

[0202] Please refer to Figure 16 , and in combination with other drawings. Among them, Figure 16 is the method flow chart of the battery 100 processing method provided in some embodiments of the present application. The battery 100 processing method provided in the embodiments of the present application is applied to the battery cell 10. It can be understood that the battery 100 processing method is used to process the battery cell 10. Among them, the battery cell 10 in this embodiment is the same as the battery cell 10 in the previous embodiment. For specific details, please refer to the relevant description of the battery cell 10 in the previous embodiment, and details are not described here.

[0203] The battery 100 processing method provided in the embodiments of the present application includes the following steps:

[0204] S10. Fix and connect at least a part of the edge sealing part 1131 of the separator 113 that extends beyond the edges of the positive electrode plate 111 and the negative electrode plate 112.

[0205] In the battery 100 processing method provided by the embodiment of the present application, by fixing at least a part of the edge sealing part 1131 of the separator 113 that extends beyond the edges of the positive electrode plate 111 and the negative electrode plate 112, at least a part of the separator 113 is fixedly connected outside the edges of the positive electrode plate 111 and the negative electrode plate 112, so that the position of at least a part of the separator 113 can be fixed to a certain extent. In this way, the separator 113 can stably and reliably wrap the positive electrode plate 111 and the negative electrode plate 112 to isolate the positive electrode plate 111 and the negative electrode plate 112, realizing insulation between the positive electrode plate 111 and the negative electrode plate 112, thereby improving the problem that the positive electrode plate 111 and the negative electrode plate 112 are overlapped due to the folding of the separator 113, and further improving the reliability of the battery cell 10.

[0206] In some embodiments, the step S10 of fixing and connecting at least a part of the edge sealing part 1131 of the separator 113 that extends beyond the edges of the positive electrode plate 111 and the negative electrode plate 112 includes the following steps:

[0207] S11. Fix and connect the edge sealing part 1131 of the separator 113 located outside the edges of the positive electrode plate 111 and the negative electrode plate 112 at the same end.

[0208] As an example, as Figures 4 to 6 , Figure 8 and Figure 9 shown, edge sealing parts 1131 are provided at both opposite ends of the positive electrode plate 111 and the negative electrode plate 112 along the first direction Z. Among the edge sealing parts 1131 at both opposite ends, only the edge sealing part 1131 at one end is fixedly connected; or, the edge sealing parts 1131 at each end are fixedly connected separately.

[0209] As another example, as Figure 7 and Figure 12 shown, edge sealing parts 1131 are provided at both opposite ends of the positive electrode plate 111 and the negative electrode plate 112 along the first direction Z and at both opposite ends of the positive electrode plate 111 and the negative electrode plate 112 along the third direction X. Among the edge sealing parts 1131 at these four ends, the edge sealing parts 1131 at each end are fixedly connected separately; or, the edge sealing parts 1131 at some ends are fixedly connected separately.

[0210] It is fixedly connected through a sealing edge portion 1131 located outside the edges at the same end of the positive electrode tab 111 and the negative electrode tab 112, so that among the same ends of the electrode assembly 11, the sealing edge portions 1131 formed by the separators 113 on the opposite sides of any one positive electrode tab 111 are fixedly connected, thereby realizing the wrapping of the positive electrode tab 111. Moreover, the sealing edge portions 1131 formed by the separators 113 on the opposite sides of any one negative electrode tab 112 are fixedly connected, thereby realizing the wrapping of the negative electrode tab 112. In this way, the sealing edge portions 1131 at each end can realize the wrapping of the positive electrode tab 111 and the negative electrode tab 112 at the corresponding end, so that the separator 113 can stably realize insulation between the positive electrode tab 111 and the negative electrode tab 112, thereby improving the problem of the positive electrode tab 111 and the negative electrode tab 112 overlapping at the corresponding end.

[0211] In some embodiments, fixedly connecting the sealing edge portion 1131 outside the edges at the same end of the separator 113 at the positive electrode tab 111 and the negative electrode tab 112 in step S11 includes the following steps:

[0212] S111: Press the sealing device 2100 on the sealing edge portion 1131 outside the edges at the same end of the separator 113 that extends beyond the positive electrode tab 111 and the negative electrode tab 112;

[0213] Specifically, in this step, press the heating element 2120 of the sealing device 2100 on the sealing edge portion 1131 of the separator 113.

[0214] S112: The sealing device 2100 heats the sealing edge portion 1131.

[0215] Specifically, in this step, heat through the heating element 2120 to make the sealing edge portion 1131 melt by heating and thus be fixed.

[0216] By adopting the above technical solution, the sealing edge portion 1131 is fixed by heat sealing.

[0217] In some embodiments, before fixedly connecting at least a part of the sealing edge portion 1131 outside the edges of the separator 113 that extends beyond the edge of the positive electrode tab 111 and the edge of the negative electrode tab 112 in step S10, the following steps are included:

[0218] S20: Stack or wind the positive electrode tab 111, the negative electrode tab 112, and the separator 113.

[0219] Understandably, the positive electrode sheet 111, the negative electrode sheet 112, and the separator 113 are first stacked to form a stacked structure of the electrode assembly 11; alternatively, the positive electrode sheet 111, the negative electrode sheet 112, and the separator 113 are first wound to form a wound structure of the electrode assembly 11. Then, the edge sealing device 2100 is used to fix the edge sealing portion 1131 of the electrode assembly 11.

[0220] With such an arrangement, after the positive electrode sheet 111, the negative electrode sheet 112, and the separator 113 are stacked or wound to form the electrode assembly 11, the operation of fixing the edge sealing portion 1131 is then carried out.

[0221] As one embodiment of the present application, as Figure 5 , Figure 6 , Figure 8 and Figure 9 shown, the battery cell 10 includes an electrode assembly 11, and the electrode assembly 11 includes a positive electrode sheet 111, a negative electrode sheet 112, a separator 113, a positive electrode tab 114, and a negative electrode tab 115. The positive electrode sheet 111 and the negative electrode sheet 112 are alternately stacked and wound, and at least a part of the separator 113 is disposed between the positive electrode sheet 111 and the negative electrode sheet 112. The positive electrode tab 114 and the negative electrode tab 115 are respectively disposed at opposite ends of the electrode assembly 11 along the first direction Z, the positive electrode tab 114 is connected to the positive electrode sheet 111, and the negative electrode tab 115 is connected to the negative electrode sheet 112. The separator 113 extends beyond the opposite ends of the positive electrode sheet 111 and the negative electrode sheet 112 along the first direction Z to form an edge sealing portion 1131, and the edge sealing portion 1131 located outside each end of the positive electrode sheet 111 and the negative electrode sheet 112 along the first direction Z is heat-sealed and fixed.

[0222] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery cell, characterized in that, It includes an electrode assembly, which includes a positive electrode tab, a negative electrode tab and a separator. The positive electrode tab, the negative electrode tab and the separator are arranged in a stacked or wound manner; a part of the separator extends beyond the edges of the positive electrode tab and the negative electrode tab to form a sealing edge portion, and at least a part of the sealing edge portion is fixedly connected.

2. The battery cell according to claim 1, wherein, The sealing edge portion located outside the edges of the positive electrode tab and the negative electrode tab at the same end is fixedly connected.

3. The battery cell according to claim 2, wherein The sealing edge portion located outside the edges of the positive electrode tab and the negative electrode tab at the same end is fixedly connected to form a fixed area, and the fixed area is arranged at intervals or continuously.

4. The battery cell according to claim 2 or 3, characterized in that, One end of the electrode assembly in the first direction is provided with a positive electrode tab and a negative electrode tab at intervals, or, the opposite ends of the electrode assembly in the first direction are respectively provided with a positive electrode tab and a negative electrode tab; the positive electrode tab is connected to the positive electrode tab, the negative electrode tab is connected to the negative electrode tab, and a sealing edge portion is provided outside at least one end of the positive electrode tab and the negative electrode tab in the first direction.

5. The battery cell according to claim 4, characterized in that, Sealing edge portions are provided outside both opposite ends of the positive electrode tab and the negative electrode tab in the first direction, and the sealing edge portions located outside each end of the positive electrode tab and the negative electrode tab in the first direction are fixedly connected.

6. The battery cell according to claim 4 or 5, characterized in that, The positive electrode tab and the negative electrode tab are arranged at intervals at one end of the electrode assembly in the first direction, and a sealing edge portion is provided outside the end of the positive electrode tab and the negative electrode tab where the positive electrode tab and the negative electrode tab are located; the sealing edge portion outside the end of the positive electrode tab and the negative electrode tab where the positive electrode tab and the negative electrode tab are located is fixedly connected and fixed to the positive electrode tab and / or the negative electrode tab.

7. The battery cell according to claim 4 or 5, characterized in that, The positive electrode tab and the negative electrode tab are respectively arranged at the opposite ends of the electrode assembly in the first direction, and sealing edge portions are provided outside both opposite ends of the positive electrode tab and the negative electrode tab in the first direction; The sealing edge portion outside the end of the positive electrode tab and the negative electrode tab where the positive electrode tab is located is fixedly connected and fixed to the positive electrode tab; and / or, the sealing edge portion outside the end of the positive electrode tab and the negative electrode tab where the negative electrode tab is located is fixedly connected and fixed to the negative electrode tab.

8. The battery cell according to any one of claims 4-7, characterized in that, The positive electrode tab, the negative electrode tab and the separator are arranged in a stacked manner in the second direction; a sealing edge portion is provided outside at least one end of the positive electrode tab and the negative electrode tab in the third direction; wherein, the first direction, the second direction and the third direction are mutually intersecting.

9. The battery cell according to claim 8, wherein, Sealing edge portions are provided outside both opposite ends of the positive electrode tab and the negative electrode tab in the third direction, and the sealing edge portions located outside each end of the positive electrode tab and the negative electrode tab in the third direction are fixedly connected.

10. The battery cell according to any one of claims 1-9, characterized in that, The sealing edge portion is fixed by heat sealing; Or, an adhesive layer is provided on the separator at the sealing edge portion, and the sealing edge portion is fixedly connected through the adhesive layer.

11. A battery, characterized in that, It includes a battery cell according to any one of claims 1-10.

12. An electrical device, characterized in that, It includes a battery cell according to any one of claims 1-10; or, it includes a battery according to claim 11.

13. A battery processing device, characterized in that, Applied to the battery cell according to any one of claims 1-10; the battery processing equipment includes: An edge-sealing device for fixedly connecting at least a part of the edge-sealing portion of the separator that extends beyond the edges of the positive electrode plate and the negative electrode plate.

14. The battery processing equipment according to claim 13, characterized in that, The edge-sealing device includes: A connecting member; A heating member disposed on the connecting member and used to heat the edge-sealing portion to fix the edge-sealing portion.

15. The battery processing equipment according to claim 14, characterized in that, The edge-sealing device includes one of the heating members; alternatively, the edge-sealing device includes a plurality of the heating members, and the plurality of heating members are spaced apart and disposed on one side of the connecting member.

16. The battery processing equipment according to any one of claims 13-15, characterized in that, The battery processing equipment further includes: An assembling device for assembling the electrode assembly to form a battery cell; A stacking device for stacking a plurality of the battery cells to form a battery.

17. A battery processing method, characterized in that, Applied to the battery cell according to any one of claims 1-10; the battery processing method includes: Fixedly connecting at least a part of the edge-sealing portion of the separator that extends beyond the edges of the positive electrode plate and the negative electrode plate.

18. The battery processing method according to claim 17, wherein, The fixedly connecting at least a part of the edge-sealing portion of the separator that extends beyond the edges of the positive electrode plate and the negative electrode plate includes: Fixedly connecting the edge-sealing portion of the separator that extends beyond the same end of the positive electrode plate and the negative electrode plate.

19. The battery processing method according to claim 18, wherein, The fixedly connecting the edge-sealing portion of the separator that extends beyond the same end of the positive electrode plate and the negative electrode plate includes: Pressing the edge-sealing device on the edge-sealing portion of the separator that extends beyond the same end of the positive electrode plate and the negative electrode plate; The edge-sealing device heats the edge-sealing portion.

20. The battery processing method according to any one of claims 17-19, characterized in that, Before the fixedly connecting at least a part of the edge-sealing portion of the separator that extends beyond the edges of the positive electrode plate and the negative electrode plate, it includes: Stacking or winding the positive electrode plate, the negative electrode plate and the separator.

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